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Siemens Q2100 Molded Case Circuit Breaker
- 100A
- 2 Pole
- Plug-On
Siemens
Q2100
Molded Case Circuit Breaker
Brand
Siemens
SKU
Q2100
Quantity
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Siemens Q2100 - 100A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Quantity
Siemens Q2100 - 100A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | Q2100 |
| Series | Q |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers |
| Wire Gauge | 4-1/0 AWG (Cu), 2-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Standards | UL 489, CSA C22.2 No. 5, HACR Rated |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip, HACR Rated |
Sold out
Quantity
Siemens Q2100 - 100A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | Q2100-R |
| Series | Q |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers |
| Wire Gauge | 4-1/0 AWG (Cu), 2-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Standards | UL 489, CSA C22.2 No. 5, HACR Rated |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip, HACR Rated |
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Description
Built for residential and commercial applications, this 100A molded case circuit breaker delivers reliable thermal-magnetic protection. It utilizes a common trip mechanism to safeguard 120/240VAC circuits against overloads and short circuits. The plug-on design mounts into Siemens load centers and serves as an exact replacement for the MP2100. Rated at 10kAIC, it includes Insta-Wire connectors for faster installation and carries HACR certification for HVAC equipment.Specifications
| Brand | Siemens |
|---|---|
| Part Number | Q2100-R |
| Series | Q |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers |
| Wire Gauge | 4-1/0 AWG (Cu), 2-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Standards | UL 489, CSA C22.2 No. 5, HACR Rated |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip, HACR Rated |
Product FAQs
6 answersWhich load centers accept the Siemens Q2100 circuit breaker?
The Q2100 is approved for installation in Siemens PL, ES, SN, and PN series load centers. It is also backward compatible with legacy ITE load centers and most Murray panels that accept Type QP breakers.
Does the Siemens Q2100 replace Murray MP-T circuit breakers?
Yes. Siemens discontinued the Murray brand and officially lists Type QP breakers as the direct UL-listed replacement for Murray MP-T series breakers. The Q2100 directly replaces the Murray MP2100 catalog number.
How much panel space is required to install the Q2100?
As a standard Type QP breaker, it requires two consecutive 1-inch pole spaces, occupying a total of 2 inches on the panel busbar.
Can the Q2100 be used as a back-fed main breaker?
Yes, the Q2100 can serve as a back-fed main breaker in a subpanel. When used in this application, electrical codes require the breaker to be secured with a physical retaining bracket. You will need a compatible hold-down kit, such as the ECMBR2 for modern Siemens and Murray load centers, or the ECMBR1 for legacy EQIII basepans.
Is the Q2100 suitable for HVAC applications?
Yes, this breaker is HACR (Heating, Air Conditioning, and Refrigeration) rated. It is tested and approved to handle the temporary inrush currents typical of HVAC compressors and motor loads without nuisance tripping.
What is the standard calibration temperature for the Q2100?
This thermal-magnetic breaker is calibrated for a standard ambient operating temperature of 40 degrees Celsius, which complies with UL 489 testing standards for branch circuit protection.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 47 reviews.
Reviews Summary
Generated by AI from 91 most recent customer reviews
Last updated 8/1/25
Customers say these circuit breakers arrive quickly and match their specifications perfectly. Many reviews mention success finding hard-to-locate specialty breakers through this supplier. Common feedback includes praise for the accurate product descriptions, reliable shipping, and competitive pricing. While some note occasional stock limitations, users consistently report the breakers fit and function as intended.
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Rating
47 reviews
- CGCrocefissa G.Verified BuyerReviewingSiemens Q115 - 15A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Quick delivery and great price.
The circuit breakers are at a great cost.
- JBJason B.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Great experience
The product was exactly what I needed and it arrived on time.
- DQDon Q.Verified BuyerReviewingSiemens Q3100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/14/26Siemens breaker
Great customer experience, great prices and fast shipping... Definitely will be buying her again.
- CSChristopher S.Verified BuyerRated 5 out of 5 stars8/12/26Siemens 60
Perfect new condition
- GSGeorge S.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/4/26Great service
Every time I call or go online you have the parts I'm looking for.